Propulsion of vessels.



No. 815,270. PATENTBD MAR. 13, 1906. T. DVIDS. PRPULSION 0F VESSELS.

APPLICATION FILED HAY Q 1905.

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THADDEUS DAVIDS, OF LITTLE NECK, NEW YORK.

PROPULSlGN OF VESSELS.

No. 85,270. Specification of Letters Patent. Patented March 13, 1906.

mamon mainly e, icas. sean in. 259.623.

To (ttt whom it may concern:

Be it known that I, Tnannsus Davies, a citizen of the United States, residing at Littie Neck, in the county of ueens and State of'New York, have invente new and useful Improvements in the Propulsion of Vessels, of which the following is a specification.

The object of my invention is the provision of means in connect i' s u n Y t h A e ull to the stern and there be deliered ot epr'o e erinasoi mass thus revente t e wa er and the edc ies caused by.r vater x 5 coming in around tue sides of the stern to the sernaf My invention consists in a vessel provided with a tube passing through the hull or extendin from the bow to the stern of a vessel zo and with a propeller located directly at the end ofthe tube.

lt further consists in certain novelties of construction and combinations of parts hereinafter set forth and claimed.

The accompanying drawings illustrate three examples of the physical embodiment of the invention constructed according to the best modes l have so far devised for the practical application of the principle.

Figure 1 is a side view of a vessel, partly in section, sho f my improvements. Fig. 2 is a plan view i ustrating the location of the shaft between the two legs of the tube. Fig.Y 3 is a sectional view showing the propeller- 3 5 shaft and a steam-.turbine located within the tube. Fig. 4 shows the tube on an enlarged scale. Fig. 5 is a section of Fig. 4 on line A B. 6 is a section of Fig. 4 on line C l). Fig. 7 is a plan view of a vessel provided with 4o two tubes and two screws or propellers.

Refe to' the figures o the drawings, the numero. 1 designates the hull of a vessel; 2, the bow; 3, the stern; 4, the tube; 5 5, the branches or legs of the tube; 6, the space be- 4 5 tween the branches of the tube for the reception of the propeller-shaft; 7, the propellershaft; 8, the propeller; 9 9, the bearings of the shaft, which may be of an suitable type; 10, in 1, a motor; 11, in 3, a steam- 5o turbine coated Within the tube; 12 12, in

Fig. 7, two parallel tubes, in this instance located one on each side of the keelson; 13 13, two propellers located at the ends of the tubes, and 14 indicates the rudder.

In Fig. 1 the motor, which may be any species of engine, is located above the tube so that the shaft slants downwardly to the propeller, the s ace 6 being provided for the said shaft by bi rcat'ing the rear end of the tube for a suitable distance. As shown in Fig. 5, the two branches are each made half round in cross-section in order that the water may be delivered to the screw throughout the entire area of its sweep less the area ol the section of the space 6 between the legs of the tube. In Fig. 3 the steam-turbine is located within the tube and the propeller-shaft parallel therewith. Fig. 'i' shows two tubes, one each side of the keelson, with a screw-propeller located 'at the rear opening 'of each tube. It will be observed that the propeller in each example is located directly at or in front of the rear opening or openings of the tube and that the tube extends in substantiall a straight line from bow to stern, so as to e irninate the friction of the water against the inner surface thereof as much as ossible. When the tube or tubes pass throng a part of the hull of the vessel, the passage for the water should as far as is practica be in a straight line. This location of the propeller is of importance for the following reason: The movement of a fluid through a pipe or tube is somewhat analogous to the movement ci a rope through the saine-that is, it .can be drawn through with greater facility and with less friction than it can be pushed orY forced through. As the propeller dis- Vplaces the water at .the stern it is obvious that gravity and the forward movement of the vessel will cause a constant discharge of the water from the tube and in a solid mass directly to the blades of the propeller, and conseguenti the encircling ed ies caused by the water owin in from the sides of the vessel will be diminished and the churning of the water with the accompanying waste of energy to an appreciable degree be eiinnnated.

Changes' and modifications of the construction in practice may of course be introduced without constituting substantial departures.

1. A vessel rovided with an open tube extendin from t e bow to the stern and havin IDO a pro g e le:` located at the stern and outside o ,angl ectly at the rear open end of the sald tu e. y

IIO

rear open ends of the branches of the tube, ang beyond and outside the ends of said tu e.

3. A vessel provided With an open tube eX- tending from the bow to the stern, the rear portion of said tube being bifurcated and each branch thereof half round in cross-section, and having a propeller located at the open ends of the branches of the tube.

4. A vessel provided with an open tube extending'from the bow to the stern and havin a propeller located at the stern and outside o and directly at the rear open end of the tube; the area in cross-section of the rear end of the tube corresponding substantially to the area of the sweep of the propeller-blades.

5. The combination with a vessel havin an open tube extending through the hull, sai tube being biurcated, of a propeller located at the rear open end of the branches, and a pro eller-shaft located between the branches of t e tube. f

6. A vessel having all open tube extending through the hull, and a pro ellver located at the stern and outside of an directly at the rear open end of the tube; the area in crosssection of the tube corresponding substantially to the area of the sweep of the propellet-blades.

7. A vessel having an open tube extending through the hull, and a pro eller located at the stern and outside of an directly at the rear open end of the tube, whereb the water which passes through the tube will be delivered in a solid mass uniformly to the ropeller throughout the area of the sweep o the propeller-blades. A

In testimony whereof I ax my signature in presence of two Witnesses.

THADDEUS DAVIDS.

Witnesses:

' STEPHEN WILSON,

CEAS. A. VAN NOSTRAND. 

